Tin: MARINE ALG.E OF NEW ENGLAND. 1G3 



rroiii New Haven nortliward. 



One of the more common Floridece north of Cape C<h1, and not rare in the. eohler 

 waters of Lon;; Isltnd anil Vineyard Sonnds. It is fonnd all the year, hut es]>e<ially 

 in the autunni and winter. It is at once reeo«Tnized hy the presence of a niidrih and 

 lateral veins and hy its «;eneral resemhlanco in outline to an oak-haf. 



D. ALATA, Lam.x. ; Pliyc. Brit., PI. 217. 



Fronds two to four inches long-, an eighth of an inch wide, stipiiate 

 below, abo\e i)innately decompound, divisions linear, margin entire, 

 costate, lateral veins scarcely visible ; tetraspores tripartite, borne in 

 the apices of the segments or in special leaflets; cystocar[)s liemisplieri- 

 cal, on the upper veins. 



Yar. ANGUSTissniA, Harv., Pliyc. lirit., PI. S3. 



Fronds very narrow, blade of the leaflets almost wanting. 



From Boston northward, with the last ; Europe. 



A common species of Northern New Enghand, hut not yet found south of Capo 

 Cotl. Our form is uniformly narrower than the common European form, and there is 

 scarcely a trace of lateral veins. Eypoglossum Grayanum, Reinsch, Contrihutiones ad 

 Algologiam et Fungologiam, p. 55, PL 42, appears to he the same as D. alata of the New 

 Enjjland coast. 



D. Lepeieukii, 3Iout.; Xer. Am. Bor., Part II, Pi. 22 v. [Uijpoglos- 

 Sinn Lcprieurii^ Kiitz. — CalogJossa Lepricurii, J. Ag., Epicr.) 



Fronds purple, one to two inches high, about a tenth of an incli wide, 

 dichotomous, articulato-constricted, costate, i)roliferous from the costa, 

 segments linear-lanceolate, attenuate, rhizoids and new leaflets formed 

 at the constrictions ; tetraspores tripartite, in oblique lines extending 

 from the midrib to the margin ; cystocarps sessile on the midrib. 



West Point, Bailey; Fort Lee, X. Y., Mr. Averill ; Uarlem River, 

 C. IT. Peel-; and common southward. 



This small species inhahits tidal rivers where the water is warm, and is found on 

 wood- work, stones, and water-plants. It is prohahly not rare near New York, and on 

 our Southern Atlantic coast it is common. It extends to the West Indies, and is also 

 fonnd in the warmer waters of hoth hemispheres. It is distinguished at onco from 

 onr other species hy its small 8ize,puiide color, and very thin constricted fronds. 

 The species was placed hy Harvey in the suhgenua Ca/o<7Zo8«a, which is separated as a 

 distinct <:enus hy Agardh in his Epicrisis. 



GRACILxVKIA, Grev. 



(From gracilis, slender.) 



Fron<ls flliform or compressed, carnoso-cartilaginous, dichotomous or 

 irre^ilarly decomi)Ound, composed of an inner layer of large angular 

 cells, which become smaller outwards, and a cortical layer of small col- 

 ored cells; antheridia in cavities sunk in the cortex or supcrlicial; 

 • •tra.spores cruciate, dispersed in the cortical layer; cystocarps exter- 

 nal, sessile, spherical or conical, witli a large cellular placenta at the 



